The Open Biochemistry Journal

ISSN: 1874-091X ― Volume 14, 2020

Short Exposures to an Extremely Low-Frequency Magnetic Field (ELF MF) Enhance Protein but not mRNA Alkaline Phosphatase Expression in Human Osteosarcoma Cells

Tania Rescigno, Anna Capasso, Bruno Bisceglia, Mario Felice Tecce*
Department of Pharmacy, University of Salerno, Fisciano (SA), Italy



Among electromagnetic fields treatments used in orthopedics, extremely low-frequency magnetic fields (ELF MF) need more detailed information about the molecular mechanisms of their effects and exposure conditions.


Evaluation of the effects of an ELF MF exposure system, recently introduced among current clinical treatments for fracture healing and other bone diseases, on Alkaline Phosphatase (ALP) activity and expression in a human osteosarcoma cell line (SaOS-2), as marker typically associated to osteogenesis and bone tissue regeneration.


Cells were exposed to the ELF MF physical stimulus (75 Hz, 1.5 mT) for 1h. Cell viability, enzymatic activity, protein and mRNA expression of alkaline phosphatase were then measured at different times after exposure (0, 4 and 24 h).


Data demonstrate that this signal is active on an osteogenic process already one hour after exposure. Treatment was, in fact, capable, even after an exposure shorter than those commonly used in clinical applications, to significantly up-regulate alkaline phosphatase enzymatic activity. This regulation is produced essentially through an increase of ALP protein level, without changes of its mRNA concentration, while assessed magnetic field did not affect cell growth and viability and did not produce temperature variations.


Tested low-frequency magnetic field affects cellular ALP expression with a posttranslational mechanism, without the involvement of regulations at gene transcription and mRNA level. This molecular effect is likely produced even within treated tissues during therapies with this signal and may be implicated in the induction of observed effects in treated patients.

Article Information

Identifiers and Pagination:

Year: 2018
Volume: 12
First Page: 65
Last Page: 77
Publisher Id: TOBIOCJ-12-65
DOI: 10.2174/1874091X01812010065

Article History:

Received Date: 4/02/2018
Revision Received Date: 02/04/2018
Acceptance Date: 03/04/2018
Electronic publication date: 17/04/2018
Collection year: 2018

© 2018 Rescigno et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: ( This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Department of Pharmacy, University of Salerno, Via Giovanni Paolo II, 132, I-84084 Fisciano (SA), Italy; Tel: +39 089 969772; Fax: +39 089 969602; E-mail:

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